Answer:
1/10.
Explanation:
When you add or subtract fractions, both fractions need to have the same common denominator. You can leave 7/10, but you have to change 3/5. You have to make 5 to a 10. To do that multiply 2 by 5 to get 10. However, you have to do the same thing to 3, so 3 times 2 is 6. Then, you get 6/10. Finally, you can subtract 7/10 minus 6/10 which is 1/10. Hope this helps!